Trick or Treat

Using ERC721::_mint() can mint ERC721 tokens to addresses which don't support ERC721 tokens. Use _safeMint() instead of _mint() for ERC721.

• Found in src/TrickOrTreat.sol Line: 81

  _mint(address(this), tokenId);

• Found in src/TrickOrTreat.sol Line: 110

  _mint(recipient, tokenId);